package com.lbc.service;

import com.alibaba.fastjson.JSON;
import com.lbc.pojo.Content;
import com.lbc.utils.HtmlParseUtil;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@RestController
public class ContentService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    //  1、解析数据放入 es 索引中
    public Boolean parseContent(String keyword)throws IOException {
        List<Content> contents = new HtmlParseUtil().parseJD(keyword);
        //  把查询到的数据放入到 es 中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");

        for (int i = 0; i < contents.size(); i++) {
            bulkRequest.add(
                new IndexRequest("jd_goods")
                .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }

        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulk.hasFailures();
    }

    //  2.获取这些数据实现搜索功能
    public List<Map<String,Object>> searchPage(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo<=1) {
            pageNo = 1;
        }
        //  条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //  分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //  精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //  执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //  解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            list.add(documentFields.getSourceAsMap());
        }
        return list;
    }

    //  3.获取这些数据实现搜索高亮功能
    public List<Map<String,Object>> searchPageHighlight(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo<=1) {
            pageNo = 1;
        }
        //  条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //  分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //  精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //  高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.requireFieldMatch(false);  // 关闭多个高亮
        highlightBuilder.preTags("<span style='color: red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);

        //  执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        //  解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {

            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();  //  原来的结果
            //   解析高亮的字段,将原来的字段换为我们高亮的字段即可！
            if (title != null) {
                Text[] fragments = title.fragments();
                String n_title = "";
                for (Text text : fragments) {
                    n_title += text;
                }
                sourceAsMap.put("title", n_title);  //  高亮的字段替换掉原来的即可
            }
            list.add(sourceAsMap);
        }
        return list;
    }

}
